/*
 * Copyright 2002-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.lightcommons.util;

import java.io.IOException;

/**
 * Subclass of IOException that properly handles a root cause,
 * exposing the root cause just like NestedChecked/RuntimeException does.
 *
 * <p>The similarity between this class and the NestedChecked/RuntimeException
 * class is unavoidable, as this class needs to derive from IOException
 * and cannot derive from NestedCheckedException.
 *
 * @author Juergen Hoeller
 * @since 2.0
 * @see #getMessage
 * @see #printStackTrace
 */
public class NestedIOException extends IOException {

	/**
	 * Construct a <code>NestedIOException</code> with the specified detail message.
	 * @param msg the detail message
	 */
	public NestedIOException(String msg) {
		super(msg);
	}

	/**
	 * Construct a <code>NestedIOException</code> with the specified detail message
	 * and nested exception.
	 * @param msg the detail message
	 * @param cause the nested exception
	 */
	public NestedIOException(String msg, Throwable cause) {
		super(msg);
		initCause(cause);
	}


	/**
	 * Return the detail message, including the message from the nested exception
	 * if there is one.
	 */
	public String getMessage() {
		String msg = super.getMessage();
		if (getCause() != null) {
            StringBuffer buf = new StringBuffer();
            if (msg != null) {
                buf.append(msg).append("; ");
            }
            buf.append("nested exception is ").append(getCause());
            return buf.toString();
        }
        else {
            return msg;
        }
	}

}
